Sandia Aerospace SA 3NVG - Manual (Page 17)

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3.3.9 SR 343 12 Pole Switching Module
The SR 343 provides 12 poles of relay switching through 3 MIL Qualified, hermetically
sealed, and nitrogen filled relays. The relays contacts are gold plated hardened silver alloy
with a 2 amp resistive load capacity at 28Vdc. Each of the three relays can be activated in-
dependently by supplying switching logic to their coils through pins 38 & 40 for K1, pins 43
& 44 for K2 and pins 48 & 49 for K3. They can also be switched as group by suppling the
switching logic to pins 39 & 45.
Pin 42 on the SR 343 is the keying pin and has been removed at the factory. A plug which is
supplied with the installation kit must be inserted into Pin 42 of the mating connector.
See figure 3-10 for a schematic and pinout of the SR 343
3.3.10 SR 623 12 Pole Switching Module
The SR 623 provides 12 poles of switching through 6 MIL Qualified, hermetically sealed,
and nitrogen filled relays. The relays contacts are gold plated hardened silver alloy with a
2 amp resistive load capacity at 28Vdc. Each of the 6 relays are switched independently or
can be switched in any combination by supplying common switching logic to their respective
coils.
Pin 39 on the SR 623 is the keying pin and has been removed at the factory. A plug which is
supplied with the installation kit must be inserted into Pin 39 of the mating connector.
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The SR 263 provides 12 poles of switching through two MIL Qualified, hermetically sealed,
and nitrogen filled relays. The relays contacts are gold plated hardened silver alloy with a 2
amp resistive load capacity at 28Vdc. Coil power is 2.6 watts max. at 25 degrees C.
Each relay can be activated independently by supplying the switching logic to their coil
through pins 38 & 40 for K1 and 43 & 44 for K2. Or they can be switched as a pair by sup-
plying the switching logic to pins 39 & 45.
Pin 46 on the SR 263 is the keying pin and has been removed at the factory. A plug which is
supplied with the installation kit must be inserted into Pin 46 of the mating connector.
See figure 3-9 for a schematic and pinout of the SR 263
3.3.8 SR 263 12 Pole Switching Module